mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-14 09:34:46 +00:00
cea42467b0
Pybind11 provides a cast operator between opaque void* pointers on the
C++ side and capsules on the Python side. The py::cast<void *>
expression was not aware of this possibility and incorrectly triggered a
compile-time assertion ("Unable to cast type to reference: value is
local to type caster") that is now fixed.
343 lines
12 KiB
Python
343 lines
12 KiB
Python
# Python < 3 needs this: coding=utf-8
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import pytest
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from pybind11_tests import builtin_casters as m
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from pybind11_tests import UserType, IncType
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def test_simple_string():
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assert m.string_roundtrip("const char *") == "const char *"
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def test_unicode_conversion():
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"""Tests unicode conversion and error reporting."""
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assert m.good_utf8_string() == u"Say utf8‽ 🎂 𝐀"
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assert m.good_utf16_string() == u"b‽🎂𝐀z"
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assert m.good_utf32_string() == u"a𝐀🎂‽z"
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assert m.good_wchar_string() == u"a⸘𝐀z"
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf8_string()
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf16_string()
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# These are provided only if they actually fail (they don't when 32-bit and under Python 2.7)
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if hasattr(m, "bad_utf32_string"):
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with pytest.raises(UnicodeDecodeError):
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m.bad_utf32_string()
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if hasattr(m, "bad_wchar_string"):
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with pytest.raises(UnicodeDecodeError):
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m.bad_wchar_string()
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assert m.u8_Z() == 'Z'
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assert m.u8_eacute() == u'é'
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assert m.u16_ibang() == u'‽'
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assert m.u32_mathbfA() == u'𝐀'
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assert m.wchar_heart() == u'♥'
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def test_single_char_arguments():
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"""Tests failures for passing invalid inputs to char-accepting functions"""
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def toobig_message(r):
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return "Character code point not in range({0:#x})".format(r)
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toolong_message = "Expected a character, but multi-character string found"
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assert m.ord_char(u'a') == 0x61 # simple ASCII
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assert m.ord_char_lv(u'b') == 0x62
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assert m.ord_char(u'é') == 0xE9 # requires 2 bytes in utf-8, but can be stuffed in a char
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char(u'Ā') == 0x100 # requires 2 bytes, doesn't fit in a char
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assert str(excinfo.value) == toobig_message(0x100)
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char(u'ab')
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assert str(excinfo.value) == toolong_message
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assert m.ord_char16(u'a') == 0x61
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assert m.ord_char16(u'é') == 0xE9
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assert m.ord_char16_lv(u'ê') == 0xEA
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assert m.ord_char16(u'Ā') == 0x100
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assert m.ord_char16(u'‽') == 0x203d
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assert m.ord_char16(u'♥') == 0x2665
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assert m.ord_char16_lv(u'♡') == 0x2661
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char16(u'🎂') == 0x1F382 # requires surrogate pair
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assert str(excinfo.value) == toobig_message(0x10000)
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char16(u'aa')
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assert str(excinfo.value) == toolong_message
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assert m.ord_char32(u'a') == 0x61
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assert m.ord_char32(u'é') == 0xE9
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assert m.ord_char32(u'Ā') == 0x100
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assert m.ord_char32(u'‽') == 0x203d
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assert m.ord_char32(u'♥') == 0x2665
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assert m.ord_char32(u'🎂') == 0x1F382
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_char32(u'aa')
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assert str(excinfo.value) == toolong_message
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assert m.ord_wchar(u'a') == 0x61
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assert m.ord_wchar(u'é') == 0xE9
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assert m.ord_wchar(u'Ā') == 0x100
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assert m.ord_wchar(u'‽') == 0x203d
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assert m.ord_wchar(u'♥') == 0x2665
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if m.wchar_size == 2:
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_wchar(u'🎂') == 0x1F382 # requires surrogate pair
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assert str(excinfo.value) == toobig_message(0x10000)
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else:
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assert m.ord_wchar(u'🎂') == 0x1F382
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with pytest.raises(ValueError) as excinfo:
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assert m.ord_wchar(u'aa')
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assert str(excinfo.value) == toolong_message
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def test_bytes_to_string():
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"""Tests the ability to pass bytes to C++ string-accepting functions. Note that this is
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one-way: the only way to return bytes to Python is via the pybind11::bytes class."""
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# Issue #816
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import sys
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byte = bytes if sys.version_info[0] < 3 else str
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assert m.strlen(byte("hi")) == 2
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assert m.string_length(byte("world")) == 5
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assert m.string_length(byte("a\x00b")) == 3
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assert m.strlen(byte("a\x00b")) == 1 # C-string limitation
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# passing in a utf8 encoded string should work
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assert m.string_length(u'💩'.encode("utf8")) == 4
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@pytest.mark.skipif(not hasattr(m, "has_string_view"), reason="no <string_view>")
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def test_string_view(capture):
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"""Tests support for C++17 string_view arguments and return values"""
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assert m.string_view_chars("Hi") == [72, 105]
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assert m.string_view_chars("Hi 🎂") == [72, 105, 32, 0xf0, 0x9f, 0x8e, 0x82]
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assert m.string_view16_chars("Hi 🎂") == [72, 105, 32, 0xd83c, 0xdf82]
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assert m.string_view32_chars("Hi 🎂") == [72, 105, 32, 127874]
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assert m.string_view_return() == "utf8 secret 🎂"
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assert m.string_view16_return() == "utf16 secret 🎂"
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assert m.string_view32_return() == "utf32 secret 🎂"
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with capture:
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m.string_view_print("Hi")
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m.string_view_print("utf8 🎂")
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m.string_view16_print("utf16 🎂")
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m.string_view32_print("utf32 🎂")
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assert capture == """
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Hi 2
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utf8 🎂 9
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utf16 🎂 8
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utf32 🎂 7
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"""
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with capture:
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m.string_view_print("Hi, ascii")
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m.string_view_print("Hi, utf8 🎂")
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m.string_view16_print("Hi, utf16 🎂")
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m.string_view32_print("Hi, utf32 🎂")
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assert capture == """
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Hi, ascii 9
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Hi, utf8 🎂 13
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Hi, utf16 🎂 12
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Hi, utf32 🎂 11
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"""
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def test_integer_casting():
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"""Issue #929 - out-of-range integer values shouldn't be accepted"""
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import sys
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assert m.i32_str(-1) == "-1"
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assert m.i64_str(-1) == "-1"
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assert m.i32_str(2000000000) == "2000000000"
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assert m.u32_str(2000000000) == "2000000000"
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if sys.version_info < (3,):
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assert m.i32_str(long(-1)) == "-1" # noqa: F821 undefined name 'long'
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assert m.i64_str(long(-1)) == "-1" # noqa: F821 undefined name 'long'
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assert m.i64_str(long(-999999999999)) == "-999999999999" # noqa: F821 undefined name
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assert m.u64_str(long(999999999999)) == "999999999999" # noqa: F821 undefined name 'long'
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else:
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assert m.i64_str(-999999999999) == "-999999999999"
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assert m.u64_str(999999999999) == "999999999999"
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with pytest.raises(TypeError) as excinfo:
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m.u32_str(-1)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.u64_str(-1)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.i32_str(-3000000000)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.i32_str(3000000000)
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assert "incompatible function arguments" in str(excinfo.value)
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if sys.version_info < (3,):
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with pytest.raises(TypeError) as excinfo:
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m.u32_str(long(-1)) # noqa: F821 undefined name 'long'
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.u64_str(long(-1)) # noqa: F821 undefined name 'long'
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assert "incompatible function arguments" in str(excinfo.value)
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def test_tuple(doc):
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"""std::pair <-> tuple & std::tuple <-> tuple"""
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assert m.pair_passthrough((True, "test")) == ("test", True)
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assert m.tuple_passthrough((True, "test", 5)) == (5, "test", True)
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# Any sequence can be cast to a std::pair or std::tuple
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assert m.pair_passthrough([True, "test"]) == ("test", True)
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assert m.tuple_passthrough([True, "test", 5]) == (5, "test", True)
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assert m.empty_tuple() == ()
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assert doc(m.pair_passthrough) == """
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pair_passthrough(arg0: Tuple[bool, str]) -> Tuple[str, bool]
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Return a pair in reversed order
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"""
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assert doc(m.tuple_passthrough) == """
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tuple_passthrough(arg0: Tuple[bool, str, int]) -> Tuple[int, str, bool]
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Return a triple in reversed order
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"""
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assert m.rvalue_pair() == ("rvalue", "rvalue")
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assert m.lvalue_pair() == ("lvalue", "lvalue")
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assert m.rvalue_tuple() == ("rvalue", "rvalue", "rvalue")
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assert m.lvalue_tuple() == ("lvalue", "lvalue", "lvalue")
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assert m.rvalue_nested() == ("rvalue", ("rvalue", ("rvalue", "rvalue")))
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assert m.lvalue_nested() == ("lvalue", ("lvalue", ("lvalue", "lvalue")))
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def test_builtins_cast_return_none():
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"""Casters produced with PYBIND11_TYPE_CASTER() should convert nullptr to None"""
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assert m.return_none_string() is None
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assert m.return_none_char() is None
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assert m.return_none_bool() is None
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assert m.return_none_int() is None
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assert m.return_none_float() is None
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def test_none_deferred():
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"""None passed as various argument types should defer to other overloads"""
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assert not m.defer_none_cstring("abc")
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assert m.defer_none_cstring(None)
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assert not m.defer_none_custom(UserType())
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assert m.defer_none_custom(None)
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assert m.nodefer_none_void(None)
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def test_void_caster():
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assert m.load_nullptr_t(None) is None
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assert m.cast_nullptr_t() is None
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def test_reference_wrapper():
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"""std::reference_wrapper for builtin and user types"""
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assert m.refwrap_builtin(42) == 420
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assert m.refwrap_usertype(UserType(42)) == 42
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with pytest.raises(TypeError) as excinfo:
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m.refwrap_builtin(None)
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assert "incompatible function arguments" in str(excinfo.value)
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with pytest.raises(TypeError) as excinfo:
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m.refwrap_usertype(None)
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assert "incompatible function arguments" in str(excinfo.value)
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a1 = m.refwrap_list(copy=True)
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a2 = m.refwrap_list(copy=True)
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assert [x.value for x in a1] == [2, 3]
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assert [x.value for x in a2] == [2, 3]
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assert not a1[0] is a2[0] and not a1[1] is a2[1]
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b1 = m.refwrap_list(copy=False)
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b2 = m.refwrap_list(copy=False)
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assert [x.value for x in b1] == [1, 2]
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assert [x.value for x in b2] == [1, 2]
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assert b1[0] is b2[0] and b1[1] is b2[1]
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assert m.refwrap_iiw(IncType(5)) == 5
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assert m.refwrap_call_iiw(IncType(10), m.refwrap_iiw) == [10, 10, 10, 10]
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def test_complex_cast():
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"""std::complex casts"""
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assert m.complex_cast(1) == "1.0"
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assert m.complex_cast(2j) == "(0.0, 2.0)"
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def test_bool_caster():
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"""Test bool caster implicit conversions."""
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convert, noconvert = m.bool_passthrough, m.bool_passthrough_noconvert
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def require_implicit(v):
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pytest.raises(TypeError, noconvert, v)
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def cant_convert(v):
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pytest.raises(TypeError, convert, v)
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# straight up bool
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assert convert(True) is True
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assert convert(False) is False
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assert noconvert(True) is True
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assert noconvert(False) is False
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# None requires implicit conversion
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require_implicit(None)
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assert convert(None) is False
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class A(object):
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def __init__(self, x):
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self.x = x
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def __nonzero__(self):
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return self.x
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def __bool__(self):
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return self.x
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class B(object):
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pass
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# Arbitrary objects are not accepted
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cant_convert(object())
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cant_convert(B())
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# Objects with __nonzero__ / __bool__ defined can be converted
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require_implicit(A(True))
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assert convert(A(True)) is True
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assert convert(A(False)) is False
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@pytest.requires_numpy
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def test_numpy_bool():
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import numpy as np
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convert, noconvert = m.bool_passthrough, m.bool_passthrough_noconvert
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# np.bool_ is not considered implicit
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assert convert(np.bool_(True)) is True
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assert convert(np.bool_(False)) is False
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assert noconvert(np.bool_(True)) is True
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assert noconvert(np.bool_(False)) is False
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def test_int_long():
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"""In Python 2, a C++ int should return a Python int rather than long
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if possible: longs are not always accepted where ints are used (such
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as the argument to sys.exit()). A C++ long long is always a Python
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long."""
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import sys
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must_be_long = type(getattr(sys, 'maxint', 1) + 1)
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assert isinstance(m.int_cast(), int)
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assert isinstance(m.long_cast(), int)
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assert isinstance(m.longlong_cast(), must_be_long)
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def test_void_caster_2():
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assert m.test_void_caster()
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